隔週
かくしゅう · kakushuu · JLPT N1 · adverb
every other week
隔 — 阜 (mound 阝) + 鬲 (cauldron, phonetic)
A semantic-phonetic compound. The left element 阝 (mound/hill) suggests a barrier or separation, while 鬲 (an ancient three-legged cauldron) supplies the sound. The original sense of being blocked off by terrain extended to today's meanings of 'separate,' 'partition,' or 'at an interval.'